5 Written questions
5 Matching questions
- what is a wedge?
- What is the formula to calculating work?
- does a machine reduce the amount of work that is being done? Explain.
- What is a lever? list two other examples of a lever.
- What is a pulley?
- a W= F x D, the unit Joule
- b No, the same amount of work is done, whether you do it yourself, or use a machine.
- c a double inclined plane that moves.
- d simple machine that is made of a wheel with a groove in it and a rope. it is usually used to life heavy objects.
- e a simple machine that has a fulcrum, or pivot point.
5 Multiple choice questions
- No. you are doing work on it when you pick it up, b/c when you pick it up, the direction of the movement of the object is the same as the direction of the force you are putting on it.
- a machine made of two or more simple machines. example: scissors, can openers
- turn a door knob (the wheel) the axle moves, to unfasten the door.
5 True/False questions
What is the fulcrum of a lever? → P=W / T, the unit Watts
If machines do not reduce the amount of work being done, how do they help us? → Machines can change the size of the input force necessry. Also, they can change the direction of the force, which is especially helpfulo when we are trying to life somthing.
What is "power", scientifically speaking? → the rate at which work is done.
what is a screw? → a inclined plane that is wrapped in a spiral, usually on a rod, but not always.
Whats a wheel and axle? → a simple machine that is made of a circular object connected to a rod.